Apparatus for manufacturing white pigment.



PATENTED MAY 26, 1903.

J. B; HANNAY. APPARATUS FOR MANUFACTURING WHITE PIGMENT.

APPLIOATION FILED 0GT.10, 1902.

R0 MODEL.

M4185, j rw'em 571 @M 66 I JWNZQZZM u flame UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

JAMES BALLANTYNE HANNAY, OF LOOH LONG, SCOTLAND.

SPECIFICATION forming part of Letters Patent No. 729,493, dated May 26, 1903.

Original application filed August 30, 1901, Serial No. 73,871. Divided and this application filed October 10,1902.

Serial No. 126,799. (No model.)

have invented certain new and useful In1, provements in Apparatus for Manufacturing White Pigment, (for which I have made ap plication for Letters Patent in Germany, No. H. 27,103, dated November 29, 1901; in Germany, No. H. 27,641, dated February 28, 1902;

in Germany, dated August 21,1902 in France,

No. 316,708, dated December 9, 1901; in Bel gium, No. 160,480, dated December 21," 1901; in Austria, dated January 20, 1902; in Italy, No. 43, Vol. 152, dated March 31, 1902; in Sweden, No. 116 02, dated January 21, 1902; in Norway, N o. 14,732,dated January 24,1902;

, in llungary,No. 24,438,datedJanuary25,1 902;

in Luxemburg, No. 4,672, dated January 22, 1902; in Switzerland, No. 28,604, dated J anuary 27, 1902; in Russia, No. 16,215, dated January 15/28, 1902; in Spain, No. 29,189, dated June 6, 1902; in Turkey, No. 999, dated J a11- uary 30, 1902; in Canada, No. 98,597, dated February 8,1902; in Victoria, No.19,005,dated February 26, 1902; in New South Vales, No.7 11,809, dated February 27, 1902; in Portugal,

No. 3,900, dated June 23, 1902, and in Great Britain, No. 2,297, dated February 1, 1901,) of which the following is a specification.

My invention relates to apparatus used in the manufacture of white pigment of basic sulfate of lead from galena or other sulfid-oflead ore by furnacing operations.

My invention consists in improvements in furnaces suitable for the oxidation of lead sulfid to lead sulfate.

Referring to the accompanying drawings, Figure 1 is a sectional elevation of my improved furnace. Fig. 2 is a plan of the same.

In carrying myrinvention into effect I construct a cylindrical furnace a with a basiclined cylindrical interior I). Preferably Iuse the common magnesia and lime basic material, asemployed in the basic-steel process. I line the furnace with this basic material made into suitable bricks or by ramming it around a central core. On the plate-iron bottom 0 of the furnace is placed a layer of coke breeze d and a pile of the coke slabs 6. Three twyers f enter the furnace at about twenty inches below the top surface of thecoke e, which is built up to the level of an air-inlet g, other air-inlets, h, being provided farther up the furnace.

A conveyer or other device 'm feeds the galena down a vertical passage is, opening into an inclined pipe j ,in which is a suitably curved and inclined platen for distributing the galena evenly over the coke. At the top of the furnace is a chimney 0, fitted with a damper p for use when starting the furnace. An exit 2' for the fume, also fitted with a damper 5, connects thefurnacewitha dust-box nthrough which the fume is drawn on its way to the condensing and collecting apparatus.

From the top of the dust-box 0" a valve-cork trolled branch pipe 101 leads to a fan and condenser, which is common to a number of furnaces and is used to draw discolored fume when accidentally produced.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A furnace for the production of white sulfate of lead pigment consisting of a hearth, coke slabs piled on the same,afurnacebody with a basic lining, air-inlets for both forced and induced draft, together with means j for feeding granular galena into the furnace.

2. A furnace for the production of white sulfate of lead pigment consisting of a hearth formed by a layer of coke breeze on a metal plate, a furnace-body with a basic lining, air-inlets for both forced and induced draft, together with means for feeding granular galena into the furnace.

3. A furnace for the production of white sulfate of lead pigment consisting of a hearth formed by a layer of coke breeze on a metal plate, a furnace-body with a basic lining, air-inlets for both forced and induced JAMES BALLANTYNE HANNAY.

Vitnesses:

FRANCIS JAMES BIGNELL, BERTRAM H. T. MATTHEWS. 

